Updating linq to sql entities best online dating intellectuals
When a new entity is attached, deferred loaders for any child collections (for example, Entity Set collections of entities from associated tables) are initialized. When Submit Changes is called, members of the child collections are put into an state. To update members of a child collection, you must explicitly call Attach and specify that entity. Attach attaches all entities in the object graph of the provided object. As an aside - the massive Data Adapter 1.x like SQL generated above applies only to these detached updates.It looks like if you do direct change tracking on on the object (ie. This is an update WITH a timestamp field: updating and checking only those values that have changed plus the timestamp and the PK.But the experience is still not what I would call intuitive.Ok, so the following code is an aproximation of a very simple disconnected operation.
So, as mentioned in the last post if there's no timestamp member or other 'versioning' mechanism provided there's apparently no way for LINQ to determine whether that data has changed.So the concurrency check is already occurring anway so no worries there. If there are differences they would be detected by the WHERE clause in the first place.This whole update mechanism and Attach seems completely redundant in light of the SQL already going to the server.The issue is this: I want to basically create an instance of an entity through LINQ then disconnect from LINQ's data context. Then I want to reattach it later to the context and have it appropriately update the database.Now in the original example I used my own sample data and no matter what I tried it didn't work. I could not get updates to work (and in fact it still doesn't work with my data) but I did get it to work with Northwind.
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Use the Attach methods with entities that have been created in one Data Context, serialized to a client, and then deserialized back (with the intention to perform an update or delete operation).